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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2013
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
A reconciliation of the Company's consolidated federal statutory and effective income tax on income from continuing operations is as follows (in thousands):
 
THREE MONTHS ENDED
 
SIX MONTHS ENDED
 
JUNE 30
 
JUNE 30
 
2013
 
2012
 
2013
 
2012
Income from continuing operations before income tax provision:
$
7,243

 
$
4,830

 
$
13,080

 
$
11,580

Statutory taxes at 35%
$
2,535

 
$
1,691

 
$
4,578

 
$
4,053

Discrete items:
 
 
 
 
 
 
 
Other
140

 
10

 
(2
)
 
21

 
140

 
10

 
(2
)
 
21

Other permanent items:
 

 
 

 
 

 
 

NACoal percentage depletion
(711
)
 
(346
)
 
(1,297
)
 
(949
)
Other
132

 
32

 
232

 
300

 
(579
)
 
(314
)
 
(1,065
)
 
(649
)
Income tax provision
$
2,096

 
$
1,387

 
$
3,511

 
$
3,425

Effective income tax rate
28.9
%
 
28.7
%
 
26.8
%
 
29.6
%